Question # 1

The isomerism in which the compounds differ with respect to functional group but have same molecular formula is called

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Metamerism

Functional group isomerism

Position isomerism

Chain isomerism

If the distance between Na⁺ and CI^- ions in sodium chloride crystal is X pm,the length of the edge of the unit cell is

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4X om

X/4 pm

X/2 pm

2X pm

NH₃gas is liquefied more easily than N₂Hence

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Van der Waals constants a and b of NH₃> that of N₂

Van der Waals constants a and b of NH₃< that of N₂

a(NH₃) > a (N₂) but b (NH₃) < b(N₂)

a (NH₃) < a (N₂) but b (NH₃) > b (N₂)

An electron with drawing group attached to e-position in phenol

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makes it basic

Stabilises the phenoxide ion

decreases its basicity

allows it to precipitate in aqueous solution

Second order of protein structure refers to

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Number and sequence of amino acids

Three dimensional structure of protein

Proteins formed of more than one monomer

Bending of protein molecule

Half of the mass of atmosphere is concentrated above earth at the hieght of

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40 Km

25-28 Km

5-6 Km

100 Km

During the manufacturing process of cement the temperature of the decomposition zone goes up to:

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600°C

800°C

1000°C

1200°C

For incineration temperature range is (in ^oC)

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700-800

800-900

900-1000

1000-1100

Which one of the following organic acids is made form methanol?

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acetic acid

bothanic acid

formic acid

propanoic acid

Super conductors are derived from compounds of

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P-block elements

Lanthanides

Actinides

Transition elements

1 gram molecule refers to amount in grams

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Equivalent to 1 mole of an atom

Equivalent to 1 mole of a molecule

Equivalent to 1 mole of an ionic species

Of an ionic compound

Acetic acid is 1.33% ionized, In 1000 molecules of 0.1 M acetic acid the number of H⁺ions is

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1.33

13.3

1.33

1

Which of the following metal exhibits more than one oxidation?

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Na

Mg

Fe

Al

Plastics are a pollution problem because many plastics

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Are made from petroleum

Are very inflammable

Burn to produce toxic fumes

Decompose to produce toxic products

The rate of E₁reaction depends upon:

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The concentration of substrate

The concentration of nucleophile

The concentration of substrate as well as nucleophile

None of these

Isotopes differ in the

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Number of neutrons

Number of protons

Number of electrons

Number of atoms

When we perform the same reaction by taking two different initial concentrations of a reactant for a second order reaction then

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Reaction becomes exothermic

Energy of activation is different

Mechanism of reaction is changed

Half life period is changed

After chlorination, the pulp is washed at:

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20°C

30°C

40°C

60°C

The three N - Hσ-bonds are made by

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sp³- s overlap

sp²- s overlap

P - p overlap

sp - overlap

Replacement of Cl of Chlorobenzene to give phenol requires drastic conditions but chlorine of 2, 4-Dinitrochlorobenzene is readily replaced because

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NO₂makes the electron rich ring at ortho and para positions

NO₂withdraws electrons at metaposition

NO₂donate electrons at m-position

NO₂withdraws electrons at ortho and para position

Which of the following element's outermost orbits last electron has magnetic quantum number m=0?

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Na

O

Cl

N

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154 pm

133 pm

120 pm

150 pm

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